From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Experiments with one-piece and two-piece distributing pipe models and nozzles to improve fuel distribution.
| Identifier | WestWitteringFiles\S\March1928-May1928\ Scan118 | |
| Date | 21th April 1923 guessed | |
| contd:- -2- (1) The one piece model had a flattened part in the distributing pipe to make room for the carburetter flange - see sketch - and this was found to have a beneficial effect on the distribution. (2) The slot of the one piece pipe was longer and terminated in line with the centres of the centre ports. A further improvement was effected by employing a nozzle like that shewn here. The inside of the nozzle was tapered to .250 wide, the long edge projected .500 into the distributing pipe and the short edge projected .100. [Sketch of a nozzle with dimensions .500 and .100] As a result of these experiments we are making up a pipe for test on the two piece scheme to have a slot 12.5" long .4" wide with the spray nozzle as shewn above and also with the flattened portion in the distributing pipe like the one piece pipe. We have appended some curves giving a comparison of the present standard induction system and the one piece over head feed weir shewing the torque when the mixture strength is varied over a wide range. These were taken without any induction pipe heating at a constant speed of 1000 r.p.m. From these curves we see that if the mixture is weakened a lower specific consumption is obtained than with the standard pipe. The lowest specific consumption with the std. pipe is .57 pts/HP/hr. Whereas we obtain .54 pts/HP/hr with the weir type | ||